docs: def check_exists_in_object(method, obj, required_fields):
      """Checks if required fields have a value in the object instance.
      Throws an exception with the missing fields.
  
      :param object obj: Object to check.
      :param typle required_fields: Required fields that must have a value.
      """
      missing = []
      for field in required_fields:
          if getattr(obj, field) is None:
              missing.append(field)
      if missing:
          raise PyCronofyValidationError('Method: %s. Missing auth field(s): %s' % (method, missing),
                                         method,
                                         missing
                                         )